Idea

In some channels it's commonplace to correct your mistakes with a pseudo-regex, for example:

<Foo> I love badgers!
<Bar> Badgers, really?!
<Foo> s/badgers/horses/

Instead of mentally parsing it, get irssi to do it!

It needs some security and sanity checking for the replacement string, and should have a couple of thresholds / restrictions. Something like:

users can only modify their own lines
items beyond a certain number of lines aren't touched
items older than a certain threshold aren't touched
s/a/b/g isn't allowed (but difficult to generalise - how little is too little. Maybe run the match and count the number of matches?
- Only the first N possible matches will be applied?
  Other notes:
There should be a visual cue to indicate it's been applied (* at the start/end of the line, maybe)
Do you remove the line which contains the replacement command?
Have to ensure it only gets applied to actual message contents, not parts of the UI /formats (timestamps, nicks, etc)
See Also

shabble / irssi-scripts